Move Win32 resource emission to the compiler

[MichalStrehovsky]

Fixes #79634.

To generate Win32 resources, we'd first use an MSBuild task to dump Win32 resources from the input IL module into a .res file. We'd then pass the .res file to link.exe. Link.exe would then invoke cvtres.exe to convert the .res file to .obj. Link.exe then links the .obj into the final executable.

Skip all of this and instead generate the correct object data in the compiler directly. I'm reusing Win32 resource emission logic from crossgen2. It already mostly does the right thing - we just needed to split the .rsrc section into .rsrc$01 and .rsrc$02 that link.exe expects. The first part has the data directory. The second part has the actual resource data.

Contributes to #73931. The cvtres step was actually non-deterministic because it creates an object file in TEMP and embeds this temporary name into the object.

Cc @dotnet/ilc-contrib

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Issue Details

---

Fixes #79634.

To generate Win32 resources, we'd first use an MSBuild task to dump Win32 resources from the input IL module into a .res file. We'd then pass the .res file to link.exe. Link.exe would then invoke cvtres.exe to convert the .res file to .obj. Link.exe then links the .obj into the final executable.

Skip all of this and instead generate the correct object data in the compiler directly. I'm reusing Win32 resource emission logic from crossgen2. It already mostly does the right thing - we just needed to split the .rsrc section into .rsrc$01 and .rsrc$02 that link.exe expects. The first part has the data directory. The second part has the actual resource data.

Contributes to #73931. The cvtres step was actually non-deterministic because it creates an object file in TEMP and embeds this temporary name into the object.

Cc @dotnet/ilc-contrib

Author:	MichalStrehovsky
Assignees:	-
Labels:	area-NativeAOT-coreclr
Milestone:	-

[jkotas]

It looks like we have an arbitrary difference in how these RelocTypes are used between crossgen vs. ilc. Which one is right?

(just asking, not something to fix in this PR)

[MichalStrehovsky]

The one crossgen2 is using came from a projectn integration and never meant anything in nativeaot. But it looked like absolute has some meaning to crossgen2 so it's all confusing.

[jkotas]

Thank you!

[jkotas]

Build error:

 Unhandled exception: Internal.TypeSystem.TypeSystemException+FileNotFoundException: Failed to load assembly '--resilient'
     at Internal.TypeSystem.ThrowHelper.ThrowFileNotFoundException(ExceptionStringID, String) + 0x30
     at ILCompiler.CompilerTypeSystemContext.GetModuleForSimpleName(String, Boolean) + 0xca
     at ILCompiler.Program.Run() + 0xd5a